Hardware Handshaking - Motorola Symbol LS2208 Product Reference Manual

6 - 14 Symbol LS2208 Product Reference Guide

Hardware Handshaking

The data interface consists of an RS-232 port designed to operate either with or without the hardware handshaking
lines, Request to Send (RTS), and Clear to Send (CTS).
Disable Standard RTS/CTS handshaking to transmit scan data as it becomes available. Select Standard RTS/CTS
handshaking to transmit scan data according to the following sequence:
•
The scanner reads the CTS line for activity. If CTS is asserted, the scanner waits up to Host Serial Response
Time-out for the host to negate the CTS line. If, after the Host Serial Response Time-out (default), the CTS
line is still asserted, the scanner sounds a transmit error, and discards any scanned data.
•
When the CTS line is negated, the scanner asserts the RTS line and waits up to Host Serial Response
Time-out for the host to assert CTS. When the host asserts CTS, the scanner transmits data. If, after the Host
Serial Response Time-out (default), the CTS line is not asserted, the scanner sounds a transmit error, and
discards the data.
•
When data transmission completes, the scanner negates RTS 10 msec after sending the last character.
•
The host should respond by negating CTS. The scanner checks for a negated CTS upon the next data
transmission.
During data transmission, the CTS line should be asserted. If CTS is deasserted for more than 50 ms between
characters, the transmission aborts, and the scanner sounds a transmission error and discards the data.
If this communications sequence fails, the scanner issues an error indication and discards the data. You must
rescan the data.
If hardware handshaking and software handshaking are both enabled, hardware handshaking takes precedence.
NOTE The DTR signal is jumpered to the active state.
None
Scan the bar code below to disable hardware handshaking.
Standard RTS/CTS
Scan the bar code below to select Standard RTS/CTS hardware handshaking.
*
None
Standard RTS/CTS